Guard for power-operated machines.



J. C(KENNEY.

GUARD FOR POWER OPERATED MACHINES.

APPLICATION FILED MAY 13, 1914.

1 9 1 52,]. U6. Patented Aug. 31, 1915.

- J .22 v 5 4 a ifn v [IL M/79 v v v COLUMBIA PLANDQRAPH 120., WASHINGTON, D. c.

UNTTED STATES PATENT OFFICE. i

A ."ra vrns c. KE line Y, or YO tines Town, ome.

GUARD FOR POWER-OPERATED MAGHINFS. w 7 1 152 106 Specificatio of Letters Patent. A Patentgd Aug, 31, Application filed it'fay 13, 1914. Serial No. 838,312. v I

To all whom it mayconoem Be it known that I, JAMEs CL KENNEY, a citizen of the United States, residing at Youngstown, in the county of Mahoning, State of Ohio, have invented certain new and useful Improvements in Guards for, Power-Operated Machines; and Iv do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled inthe art to which it appertains to make and use :the same.

This invention relates to a guard for power operated machines and more particularly for the class of machines which employ reciprocating operating parts.

An object of the invention is to .provide a device of this. character which will be thrown into such position when the machine is started as toprevent access to the operating parts. p

A further object of the invention is to so construct a guard that it will protect the operator when theguard is in its uppermost osition. I p With these and other objects in View, such as will appear as the description progresses,

Y my invention comprises the combination and arrangement of parts as hereinset forth and subsequently claimed. M

Referring to the drawing, Figure 1 is a front view of my deviceapplied to a shearing machine. Fig. 2 is a side view thereof. Figs. 3 and A are fragmental details.

Referring to the drawing by reference characters wherein like parts are indicated by like characters throughout the several views, 1 indicates the frame of the machine on which the main drive shaft 2 is mounted which has a driving gear 3 and a clutch 4: for fixing the gear to the shaft. Operated by the said shaft 2 is a shearing blade 5 which reciprocates upward and downward during the operation of the machine and cotiperates with a blade 6 on the bed of the machine, which latter blade is located on the inner portion of the Work support 7. a 4 7 Pivoted to each end of the machine is a lever 8, pivoted as at 9, to the frame of the machine. The -long-arms of these levers ex-. tend forwardly beyond the forward face of the cutting blade 6. The forwardends of the said levers being adjustably secured by set screws 10 to sleeves 11 on links 12 secured to the standards 13 by bolts 12 insertible in holes 12" by means of which the v an enlarged head 18 on the end thereof,

which extends upwardly and downwardly in the hole l t in the adjacent standard. I In order that the heads 18 may be held within the' holes in the standards '13 there is provided onithe'upper endsof the heads a'pairfof hooks 19 which embrace the sides of the standards and are engaged with coil springs 20 fixedly mounted at their lower ends by means of hooks 21 to thelowermost portions of casin'gs'22 which are secured longitudi-nally of the standards 13. and at tached thereto. In the inner faces of these casings slots '23 are formed which extend longitudinally of the said casings and through which the hooks' 19 extend and are adapted to reciprocate.

iOnthe inner faces of the standards '13 adjacent the lower ends thereof are formed lugs 24 whichcooperate with lugs 25 on the ends of the frame 15 to limit the downward movement of the said frame with relation to the standards.

The rearmost arm 26 of each of the levers 8 is'attached to a link 27, which link is pivotally secured toa treadle 28 having a counterweight29 on one len'd thereof and a foot piece 30 secured to the forward end thereof and extending tothe'other ofsaid 'treadles;

A clutch operating arm 31 is pivotally se cured at 82 to the forward arm of the lever 8 and is attached to the clutch A on the drive shaft 2 so as to operate the same.

When the guard is in its operative .posiis secured extendsbetween said standards, thesprings 20 having been extended by the contacting of the lower ends of the heads 18 with the upper face of the work support.

The device assumes this position when the device is in operation.

Assuming that the guard is in its uppermost position, as shown in full lines in Fig. 2, the clutch is disengaged and the machine is at a position of rest. If it isdesired to operate the machine the foot piece 30 is pushed downwardly, which rotates the treadle 28 about its pivot and pushes the link 27 upwardly, this rotates the 'lever about its pivot and moves the frame 15 downwardly, and at the same time the rod 31 is operated to throw in the clutch which causes the machine to start, the downward movement of the guard is in advance of the downward movement of the cutting blade 5 so that access will be prevented from the said cutting blade during the operation of the machine. When the lowermost portion of the frame 15 contacts with the upper face of the work support 7, the portions 18 of the said frame which are slidably'mounted in the standards 13 are'pushed upwardly therein against the tension of the springs 20, andthe lowermost portion of the standards contacts with the upper face of the work support on the further move ment of the .treadle. During this position of the guard it is impossible for the operator to insert his hands or other parts of his body in the line of movement of the reciprocating parts of the machine; After the operation has been completed the foot piece 30 ofthe treadle 28 is released andthe weight 29 on the opposite end thereof pulls the link 27 downwardly, which rotates the levers 8 about their pivots 9 so as to move the forward ends ofthe levers upwardly and I with them the guard members, and at the sametime the rod 311s moved outwardly and throws out the clutch so that the machine stops a little in advance of. the upward movement of the guard. When the guard is moved upwardly the springs 20 exert pressure on the hooks 19 so 'as .to pull the frame 15 downwardly, and'this extends the said frame below the standards 12. The downward movement of this frame is limited by the contacting of the lugs '24 on the standards and of lugs 25 on the frame. By projecting this frame downwardly in this manner, the devic'estill operates to guard the operating'parts, inasmuch as the distance between the work support and the lower end of the frame 15 is just sufficient to allow the work tween. c

From the foregoing description it may be seenthat I have provided a device which will effectively guard a machine, the parts to be inserted therebe- ,of which reciprocate so that the operator may not be injured by inserting parts of his body in the line of movement of the reciprocating parts. a i

I have still further provided a device which will prevent access to the said reciprocating parts of the machine during the operation of the machine, and which will also act as a guard during the inserting of the work into the operating parts.

While I have described my device as attached to a'particular type of machine, I wish it to be understood that it is only illustrated as attached to that type of machine for the sake of convenience, for I wish to reserve the right to use it in connection with any machine wherein the parts are movable in such a manner that if an-operator insert his hands or other parts of his body between the operating parts he will receive in ury.

What is claimed is g 1. In combination with a machine having reciprocating parts, a guard pivoted thereto, said guard comprising hollow elongated standards having slots in their inner faces, a frame extending between said standards and secured thereto, heads formed on the ends of said frame and slidably mounted in the standards, hooks secured to said heads, springs secured to the standards at their lower ends and at their other ends to the hooks, casings for said springs, and

means to limit the movement of theframe with relation to the standards in one direction. I v

2. In combination with a machine having a reciprocating tool and a work support, levers pivoted to the opposite sides of said machine and adapted to swing in vertical planes, standards secured to the forward ends of said levers, a rectangular guard slidably mountedbetween and supported by said standards, resilient means for causing said guard to extend downwardly from the lower ends of said standards when the latter are raised and means for moving said levers in such manner that the standards will be lowered and the guard moved up-. wardly therein until the lower ends of the standards engage the work support.

In testimony whereof, I affix my signa ture, in the presence of two witnesses.

JAMES 'o. KENNEY.

Witnesses: U

C. H. FRANKLIN, W. H. Rooms.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, 2 Washington, D. C. 

